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b38edf994b
When passing a nullptr as the pixel array LibGL now allocates texture memory but does not initialize the texture contents.
89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
/*
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Format.h>
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#include <LibGL/GL/gl.h>
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#include <LibGL/Tex/Texture2D.h>
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#include <string.h>
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namespace GL {
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void Texture2D::upload_texture_data(GLenum, GLint lod, GLint internal_format, GLsizei width, GLsizei height, GLint, GLenum format, GLenum, const GLvoid* pixels)
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{
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// NOTE: Some target, format, and internal formats are currently unsupported.
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// Considering we control this library, and `gl.h` itself, we don't need to add any
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// checks here to see if we support them; the program will simply fail to compile..
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auto& mip = m_mipmaps[lod];
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mip.set_width(width);
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mip.set_height(height);
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// No pixel data was supplied. Just allocate texture memory and leave it uninitialized.
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if (pixels == nullptr) {
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mip.pixel_data().resize(width * height);
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return;
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}
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m_internal_format = internal_format;
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const u8* pixel_byte_array = reinterpret_cast<const u8*>(pixels);
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mip.pixel_data().clear();
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if (format == GL_RGBA) {
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for (auto i = 0; i < width * height * 4; i += 4) {
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u32 r = pixel_byte_array[i + 0];
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u32 g = pixel_byte_array[i + 1];
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u32 b = pixel_byte_array[i + 2];
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u32 a = pixel_byte_array[i + 3];
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u32 pixel = ((a << 24) | (r << 16) | (g << 8) | b);
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mip.pixel_data().append(pixel);
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}
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} else if (format == GL_BGRA) {
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for (auto i = 0; i < width * height * 4; i += 4) {
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u32 b = pixel_byte_array[i + 0];
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u32 g = pixel_byte_array[i + 1];
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u32 r = pixel_byte_array[i + 2];
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u32 a = pixel_byte_array[i + 3];
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u32 pixel = ((a << 24) | (r << 16) | (g << 8) | b);
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mip.pixel_data().append(pixel);
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}
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} else if (format == GL_BGR) {
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for (auto i = 0; i < width * height * 3; i += 3) {
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u32 b = pixel_byte_array[i + 0];
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u32 g = pixel_byte_array[i + 1];
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u32 r = pixel_byte_array[i + 2];
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u32 a = 255;
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u32 pixel = ((a << 24) | (r << 16) | (g << 8) | b);
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mip.pixel_data().append(pixel);
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}
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} else if (format == GL_RGB) {
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for (auto i = 0; i < width * height * 3; i += 3) {
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u32 r = pixel_byte_array[i + 0];
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u32 g = pixel_byte_array[i + 1];
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u32 b = pixel_byte_array[i + 2];
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u32 a = 255;
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u32 pixel = ((a << 24) | (r << 16) | (g << 8) | b);
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mip.pixel_data().append(pixel);
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}
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} else {
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VERIFY_NOT_REACHED();
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}
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}
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MipMap const& Texture2D::mipmap(unsigned lod) const
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{
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if (lod >= m_mipmaps.size())
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return m_mipmaps.at(m_mipmaps.size() - 1);
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return m_mipmaps.at(lod);
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}
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}
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